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SMTP Debug Tool
Test and debug your SMTP connection, quickly and for free
verified Aug 27, 2026 · HTTP 200
CohortClass of 2023What it is
Test and debug your SMTP connection, quickly and for free
HTTP liveness
3 probes since Aug 19Aug 19Aug 27
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Aug 19, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
3 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2023weekly
3,422 products launched in 2023 · 100% still active
3,422 active0 sunset
Still active
100%
Median lifespan
4.9y